.mb {
  margin-top: 50px;
  width: 100%;
  height: 500px;
  background: url(image/bannerbg.png) no-repeat;
  background-size: cover;
  overflow: hidden;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.mb .c_rig {
  background-color: white;
  height: 350px;
  width: 320px;
  padding: 10px;
  margin-left: 30px;
}
.mb .c_rig > p {
  padding: 5px 0px;
}
.qbcg {
  margin-left: 640px;
}
.qq {
  width: 363px;
  border: 1px solid #ccc;
}
.qwer {
  padding: 0px 10px;
}
.qwer > p {
  font-size: 10px;
  font-weight: bold;
}
.nnn {
  height: 140px;
}
.m3 {
  margin-left: 50px;
  display: none;
}
@media (max-width: 768px) {
  .m1 {
    display: none;
  }
  .m3 {
    display: inline-block;
  }
  .mb {
    flex-wrap: wrap;
  }
  .qbcg {
    margin-left: 200px;
  }
  .nnn {
    height: 300px;
  }
}
